Making the menus set the price for you like this is not something that any of our tools will do for you. We have a tool that is called Dynamic Dropdowns that will allow you to make multiple dropdowns where the contents of the next list are based on the selection from the first list. You may be able to adapt this to get the price to show but that would require some javascript coding to implement correctly.
You could do something like this with the size dropdown menu on the page that a user makes their selections from. The label can be the name of the size, and the value would be the id. When the form is submitted you can filter a recordset on the submitted size id. You can then use this information to get at the price and display it on the page.
